body{
    width: 100%;
    max-width: 640px;
    min-width: 320px;
    margin: 0 auto;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: #666;
}
a{
    color: #666;
    text-decoration: none;
}
.app{
    height: 45px;
}
ul{
    margin: 0;
    padding: 0;
    list-style: none;
}
img{
    vertical-align: middle;
}
 .app ul li{
     float: left;
     height: 45px;
     background-color: #333;
     text-align: center;
     line-height: 45px;
     color: #fff;
 }
 .app ul li:nth-child(1){
     width: 8%;
 }
 .app ul li:nth-child(1) img{
          width: 10px;
         
 }
 .app ul li:nth-child(2){
     width: 10%;
 }
 .app ul li:nth-child(2) img{
     width: 30px;
     vertical-align: middle;
 }
 .app ul li:nth-child(3){
     width: 57%;
 }
 .app ul li:nth-child(4){
     width: 25%;
     background-color: #f63515;
 }
 /* 搜索 */
 .search-wrap{
     height: 44px;
     position: fixed;
     overflow: hidden;
     width: 100%;
     min-width: 320px;
     max-width: 640px;
 }
 .search-btn{
     position: absolute;
     top: 0;
     left: 0;
     /* background-color: pink; */
     width: 40px
     ;height: 44px;
 }
 .search-btn::before{
     content: '';
     display: block;
     width: 20px;
     height: 18px;
     background:url(../images/s-btn.png) no-repeat;
     background-size: 20px 18px;
     margin: 14px 0 0 15px;
 }
 .search-login{
     position: absolute;
     right: 0;
     top: 0;
     width: 40px;
     height: 44px;
     /* background-color: purple; */
     color: #fff;
     line-height: 44px;
 }
 .search{
     height: 30px;
     background-color: #fff;
     margin: 0 50px;
     border-radius: 25px;
     margin-top: 7px;
     position: relative;
 }
 .jd{
     width: 20px;
     height: 15px;
     position: absolute;
     top: 8px;
     left: 13px;
    background: url(../images/jd.png) no-repeat;
    background-size: 20px 15px;
 }
 .jd::after{
     content: '';
     display: block;
     width: 1px;
     height: 15px;
     background-color: #ccc;
     position: absolute;
     right: -8px;
 }
 .sou{
     width: 18px;
     height: 15px;
     position: absolute;
     left: 50px;
     top: 8px;
     background: url(../images/jd-sprites.png) no-repeat -81px 0;
    background-size: 200px auto ;
 }
 .slider img{
    width: 100%;
 }
 /* 品牌日 */
 .brand{
     overflow: hidden;
     border-radius: 10px 10px 0 0;
 }
 .brand div{
     width: 33.33%;
     float: left;
 }
  .brand div img{
      width: 100%;
  }
  nav{
      padding: 5px;
  }
  nav a{
      float: left;
      width: 20%;
      text-align: center;
  }
  nav a img{
      width: 40px;
     margin: 10px 0;
  }
  nav a span{
      display: block;
  }
  /* news */
  .news img {
      width: 100%;
  }
  .news a {
    box-sizing: border-box;
      float: left;
  }
  .news a:nth-child(1){
      width: 50%;
  }
  .news a:nth-child(2){
      width: 25%;

      border-left: 1px solid #ccc;
  }
  .news a:nth-child(3){
      border-left: 1px solid #ccc;
      width: 25%;
  }